Not my area of expertise and I've only installed a lift on one liberty, but this gets brought up enough that anybody on here should be able to absorb the information like a sponge sitting in water.
OME/Bilstein combo.
If you scroll through this Lift Kit Discussion forum, there's hundreds of people who have gone with the height you're looking for. You can go up to 3.5" but should get JBA upper A-Arms if you do. Any higher and you'll have spring contact on the control arms.. as well as have an askew pinion angle. I'd stay in the 2.5-3" range you're looking at already, but would go with OME springs and Bilstein shocks, although you can get OME shocks as well to match the springs.
This will set you up at 2.5" above stock, but probably about 2 1/4" in the front after it settles.
If you're looking to go slighty higher, you can do a 3/8" clevis lift using conduit nuts and it will give you an extra 3/4" of an inch of lift. This will set you at 3 1/4" lift, or about 3" after it all settles out.
You can also get top plates from JBA that will give you another 1/2" of lift if desired.
You're looking at about 850 900 bucks, but remember you will also need a bushing kit if you go bilstein that you can get through JBA. You'll also need 2 upper isolators for the front and 4 hockey pucks for bump stops in the rear. You can get Teraflex bumpstops.. and don't get crown isolators, you'll regret that.
Remember to set aside money for at least 2-3 alignments as well.
Make sure you read through a few lift install threads beforehand to make sure there's nothing else you need, and that the information I've provided is correct.
All in all.. not too bad.. 900 bucks and you should be able to sit 3" above where you do now, and have your liberty riding MUCH better than it does on its stock shocks/springs.. which IMO, are junk from the getgo.
If you just want to get a kit and not worry about getting separate parts, visit JBAoffroad. Lots of information on this site though, the search button will be your best friend once you've begun to use it!